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NOx sensor cost

NOx Sensor Replacement Cost — And When You Don't Need One

24/7 mobile AdBlue, SCR & NOx assistance — we come to you

NOx sensors are one of the most replaced — and most unnecessarily replaced — parts on a modern diesel. Before you pay for one, it's worth knowing what actually decides the price and how often the sensor turns out to be innocent.

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Mobile call-out from £150 minimum. Final cost depends on the vehicle, location, diagnosis and work required. Contact us now for current technician availability and ETA.

Most repairs are completed on site in 1–3 hours, depending on the fault and the vehicle. Already immobilised by the AdBlue system? We can get vehicles started again once the underlying fault is diagnosed and repaired.

What changes the price

  • Upstream or downstream position — access and part cost differ
  • Genuine manufacturer sensor versus a quality aftermarket equivalent
  • Whether the sensor needs coding or calibration to the module afterwards
  • Seized fittings and corroded threads on older, high-mileage vehicles
  • Whether the wiring loom or connector also needs repair

How often is the sensor actually the fault?

Plenty of NOx codes are caused by something else entirely: water in a connector, chafed wiring, an exhaust leak upstream of the sensor, under-dosing from the pump or injector, or a module that has lost calibration. Each one produces sensor-looking data from a perfectly good sensor.

We test the circuit, the heater, sensor plausibility and live dosing before recommending a sensor. If it has genuinely failed, you'll see why.

Our approach

  • Mobile call-out from £150 minimum, 24/7, at your home, work or roadside
  • Full diagnosis before any part is recommended
  • Parts quoted separately and approved by you before fitting
  • Post-repair live-data verification so the warning doesn't just come back

Keep reading

Answers

Common questions

+What does a mobile visit cost?

Mobile call-out from £150 minimum. That is the minimum call-out and service charge, not the total repair price — final cost depends on the vehicle, location, diagnosis and work required. We operate 24 hours a day, 7 days a week.

+Can I fit a NOx sensor myself?

Physically it's sometimes possible, but many vehicles need the new sensor coded or calibrated to the module, and if the original fault was wiring or dosing the warning will return. Diagnose first.

+Why did my warning come back after a new sensor?

Almost always because the sensor wasn't the cause — an exhaust leak, wiring fault or under-dosing was, and it's still there.

+How quickly can you attend?

We're available 24 hours a day, 7 days a week, but we never promise a fixed arrival time. Contact us now for current technician availability and ETA.

24 hours a day, 7 days a week

24/7 emergency AdBlue help

Send us the registration and the exact dashboard wording. Mobile call-out from £150 minimum. Final cost depends on the vehicle, location, diagnosis and work required. Contact us now for current technician availability and ETA.

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